20mm town layout

So this is just about all my finished 20mm Modern European terrain. With this I can layout a small residential section and smaller industrial section. I have 3 more house sections to build and several more industrial. Once done I should be able to set up a 6x4 table (one in pictures is 6x3) as all residential, all industrial, or all agricultural.
I also noticed after laying out the miniatures for the photos that I could use more to give proper sized squads for the rules I use so have ordered a bunch (shhh dont tell my wife).

The parking lot is not finished and I want to add some dry-brushing to the railroad tracks. I'm also going to make some road sections without sidewalks for sections out of town.

Had to lay out an assault scene just for fun.

As my collection grows so dose my concern for how to transport them. You may notice that all the build bases are the same size in at least 1 dimension. My thought is to build a box with adjustable shelfs or pegs that would allow me to stack them safely. I could also build on handles and/or wheels for transportation to and from games.